6 year old girl can't be controlled

[ConcernedOlderSister]

I'm 14 years old. My parents are divorced, And my mother has 2 other children with a different man. One is a 10 year old boy, and the other is a 6 year old girl. My mom recently got divorced with her husband, so him an my brother moved across the country while my mom and my sister stayed here. My sister has had TERRIBLE anger problems since she could talk or understand things. She's extremely violent. She threatens to kill my mother and I, and says she hopes we die. She's grabbed scissors and tried to hurt us, on many occasions. She get's extremly mad over nothing, She can't take a joke. She will lock herself in her room and scream for hours. She'll throw things and yell swears. She bosses us around 24/7. Basically, she expects to get her way. And if she doesn't, she starts a tantrum. She's never satisfied. We've had these problems before her dad and brother left, but it's gotten worse lately. We don't know how to react, and need advice. Help?
-Concerned Sister.

[margypops]

It sounds as if there is some interaction/communication problem at home , I think this child needs some help ASAP

[tinkerbell1124]

She really needs to see a shrink to get evaluated. Somethings NOT right there. I would think she's going to needs meds at the LEAST!!!! I mean NOT to scare you BUT I would want to sleep at night! I'm sure yo ALL love her, BUT you're mother needs to think of your safety too. Thats NOT normal 6 year old behavior. I mean to say I hate you from time to time, and throw fits, sure my son does that sometimes. He's even hit me (once) BUT to try and hurt you with a scissors, please have her seen soon!